How to make a concrete seat

Step 3.1 The dry mix

Pour 4½ buckets of aggregate into the wheelbarrow
and also 1 bucket of cement.

Give it a bit of a mix around with a spade.

Make a small crater in the top of the mix to take the water.

Note:
aggregate is a mixture of different size stones ranging from 20mm (¾") diameter maximum, down to the size of a grain of sand. The smaller stones fill up the cavity created by the bigger stones.

Step 3.2 The wet mix

Next add the water: approximately half a standard household bucket to begin with. Mix with the spade from underneath and fold over. Keep doing this and adding more water if required, until the mix is a uniform consistency.

Tip: when mixing, a smaller spade is easier to work with than a larger one.